Originally Posted by
7renk
My Brompton 2015 model. I want to do 39. Which brand and model do I need to purchase?
In my video on post
#2 ; I used a Shimano Dura Ace for 10 speed gruppo. You'll need to shorten the chain. When my chain wore
out; I also swapped to a 10 speed - Shimano Ultegra.
2013 Brompton DA chainring Ultegra chain by
1nterceptor, on Flickr